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It is thought that about 85% of the universe is made up of dark matter. But now scientists have taken a step towards understanding it. At the centre of the universe sits a large cloud of positively charged hydrogen gas. Normally this is neutral, but something is knocking the negatively charged particles from the gas. Now scientists think that the particles are colliding.
King's College London · Mysterious phenomenon at centre of galaxy could reveal new kind of dark matterA mysterious phenomenon at the centre of our galaxy could be the result of a different type of dark matter.